It is when your breath fogs in front of your face, when icicles form at the end of your beard, and when your nostrils feel dry and caked. It is when your adrenaline is pumping, and your hands are shaking. It is when the sweat beads in drones off the surface of your face. It is when your way is lit by the mechanical eyes of your infrared night vision.

NOTE: It is my first time ever blogging about economics, and I hope I have done well enough of a job here in my calculations to have this post be considered valid by even the most suave and sophisticated of derivative authors and Corporate Law Underwriters. This is a topic that not enough people in this country understand.